Comparing Olanzapine and Mirtazapine in the Improvement of Unintentional Weight Loss for Patients with Advanced Stage Cancer

Patients will be prescribed a dosage of 15 mg per day. Dose will not be escalated.

the participant will be prescribed a dosage of 2.5mg per day if \> 65 yrs. and 5 mg/per day if \<65 yrs. per day. Per physician discretion, participants are allowed a dose escalation of a maximum of 10mg.